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ec6f64f7b0
Decouple the sending of client restart events from the restarting of the servers. Restarts use the new Tornado restart-clients endpoint to inject "restart" events into queues of clients which were loaded from the previous Tornado process. The rate is controlled by the `application_server.client_restart_rate`, in clients per minute, or a flag to `restart-clients` which overrides it. Note that a web client will also spread its restart over 5 minutes, so artificially-slow client restarts are generally not very necessary. Restarts of clients are deferred to until after post-deploy hooks are run, such that the pre- and post- deploy hooks are around the actual server restarts, even if pushing restart events to clients takes significant time.